如何将图像上传到AWS S3并获取图像文件的S3存储桶URL并一次保存到dynamodb - Android

Question

如何将图像保存到AWS S3存储桶，然后检索图像公共网址并将网址与其他用户输入数据一起保存到dynamodb中，而无需用户离开活动或片段？ 所有这些都可以立刻实现吗？ 任何示例代码示例都会有很大帮助。 谢谢！！

Answer 1

试试这个代码 -

private void uploadImageToAWS() {

        AsyncTask<String, String, String> _Task = new AsyncTask<String, String, String>() {

            @Override
            protected void onPreExecute() {


            }



            @Override
            protected String doInBackground(String... arg0) 
            {

                if (NetworkAvailablity.checkNetworkStatus(PrintRollScreenActivity.this)) 
                {
                    try {
                        java.util.Date expiration = new java.util.Date();
                        long msec = expiration.getTime();
                        msec += 1000 * 60 * 60; // 1 hour.
                        expiration.setTime(msec);
                        publishProgress(arg0);

                        String existingBucketName = "YOUR_AWS_BUCKET_NAME";////////////
                        String keyName = "image_name";
                        String filePath = "";

                        AmazonS3Client s3Client1 = new AmazonS3Client( new BasicAWSCredentials( "AWS_KEY","AWS_SECRET") );
                        PutObjectRequest por = new PutObjectRequest(existingBucketName,
                                keyName + ".png",new File(filePath));//key is  URL

                        //making the object Public
                        por.setCannedAcl(CannedAccessControlList.PublicRead);
                        s3Client1.putObject(por);


                        String _finalUrl = "https://"+existingBucketName+".s3.amazonaws.com/" + keyName + ".png";

                    } catch (Exception e) {
                        // writing error to Log
                        e.printStackTrace();


                    }




                } 
                else
                {

                }


                return null;

            }
            @Override
            protected void onProgressUpdate(String... values) {
                // TODO Auto-generated method stub
                super.onProgressUpdate(values);
                System.out.println("Progress : "  + values);
            }
            @Override
            protected void onPostExecute(String result) 
            {

            }
        };
        _Task.execute((String[]) null);


    }

Answer 2

这是我将图像上传到S3的方式：

CognitoCachingCredentialsProvider credentialsProvider = 
             new CognitoCachingCredentialsProvider(
             context.getApplicationContext(),
             YOUR_IDENTITY_POOL_ID,
             Regions.US_EAST_1);

AmazonS3Client s3Client = new AmazonS3Client(credentialsProvider);

TransferUtility transferUtility = new TransferUtility(s3Client, context.
                      getApplicationContext());

TransferObserver observer = transferUtility.upload(
       MY_BUCKET,           // The S3 bucket to upload to
       OBJECT_KEY,   // The key for the uploaded object 
       FILE_TO_UPLOAD // The location of the file to be uploaded );

在您的清单文件中有这个：

 <uses-permission android:name="android.permission.INTERNET" />  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

 <service android:name= "com.amazonaws.mobileconnectors.s3.transferutility.TransferService" android:enabled="true" />

信息来源在这里

我在S3 bucket public中创建了文件夹并保存了dynamoDB中的文件链接：“ https://mybucket.s3.amazonaws.com/myfolder/myimage.jpg ”

-

Answer 3

S3中的每个对象都可以具有私有或公共访问权限。

如果它是公共的，则公共URL始终是http(s)://s3(-region).amazonaws.com/BUCKET/KEY因此第1阶段。

如果您同步上传，最后您可以将有关该链接的元数据保存到DynamoDB，并确保您已修复。